# 如果定义了ANDROID_BUILD_SHELL，则ANDROID_BUILD_SHELL

# 否则使用默认的/bin/bash

ifdef ANDROID_BUILD_SHELL

SHELL := $(ANDROID_BUILD_SHELL)

else

SHELL := /bin/bash

endif

# Utility variables.

empty :=

space := $(empty) $(empty)

comma := ,

# Note that make will eat the newline just before endef.

define newline

endef

# 不能简单的定义\或\\

backslash := \a

backslash := $(patsubst %a,%,$(backslash))

# python有关

export PYTHONDONTWRITEBYTECODE := 

# 标准源目录

SRC_DOCS:= $(TOPDIR)docs

# TODO: 强制一些层，当模块连接针对特定库时仅仅添加一些头文件路径

# TODO: 查看可以从这些全局列表删除的。

SRC_HEADERS := \

        $(TOPDIR)system/core/include \

        $(TOPDIR)hardware/libhardware/include \

        $(TOPDIR)hardware/libhardware_legacy/include \

        $(TOPDIR)hardware/ril/include \

        $(TOPDIR)libnativehelper/include \

        $(TOPDIR)frameworks/native/include \

        $(TOPDIR)frameworks/native/opengl/include \

        $(TOPDIR)frameworks/av/include \

        $(TOPDIR)frameworks/base/include

SRC_HOST_HEADERS:=$(TOPDIR)tools/include

SRC_LIBRARIES:= $(TOPDIR)libs

SRC_SERVERS:= $(TOPDIR)servers

SRC_TARGET_DIR := $(TOPDIR)build/target

SRC_API_DIR := $(TOPDIR)prebuilts/sdk/api

SRC_SYSTEM_API_DIR := $(TOPDIR)prebuilts/sdk/system-api

# 特定工具的路径

SRC_DROIDDOC_DIR := $(TOPDIR)build/tools/droiddoc

# 避免硬件解码路径被覆盖的调用pathmap.mk建立硬解映射

include $(BUILD_SYSTEM)/pathmap.mk

# 构建系统内部文件（写Android.mk时会调用include头文件，也就是这些makefile文件）

CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk

BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mk

BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk

BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk

BUILD_RAW_STATIC_LIBRARY := $(BUILD_SYSTEM)/raw_static_library.mk

BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk

BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk

BUILD_RAW_EXECUTABLE:= $(BUILD_SYSTEM)/raw_executable.mk

BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk

BUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mk

BUILD_PHONY_PACKAGE:= $(BUILD_SYSTEM)/phony_package.mk

BUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mk

BUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mk

BUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mk

BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk

BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk

BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk

BUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mk

BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk

BUILD_NATIVE_TEST := $(BUILD_SYSTEM)/native_test.mk

BUILD_HOST_NATIVE_TEST := $(BUILD_SYSTEM)/host_native_test.mk

BUILD_SHARED_TEST_LIBRARY := $(BUILD_SYSTEM)/shared_test_lib.mk

BUILD_HOST_SHARED_TEST_LIBRARY := $(BUILD_SYSTEM)/host_shared_test_lib.mk

BUILD_STATIC_TEST_LIBRARY := $(BUILD_SYSTEM)/static_test_lib.mk

BUILD_HOST_STATIC_TEST_LIBRARY := $(BUILD_SYSTEM)/host_static_test_lib.mk

BUILD_NOTICE_FILE := $(BUILD_SYSTEM)/notice_files.mk

BUILD_HOST_DALVIK_JAVA_LIBRARY := $(BUILD_SYSTEM)/host_dalvik_java_library.mk

BUILD_HOST_DALVIK_STATIC_JAVA_LIBRARY := $(BUILD_SYSTEM)/host_dalvik_static_java_library.mk

-include cts/build/config.mk

# 解析目标修饰符，make目标包含showcommands，则打印全命令

SHOW_COMMANDS:= $(filter showcommands,$(MAKECMDGOALS))

# 设置通用值

# 全局变量、cflags

COMMON_GLOBAL_CFLAGS:= -DANDROID -fmessage-length= -W -Wall -Wno-unused -Winit-self -Wpointer-arith

COMMON_RELEASE_CFLAGS:= -DNDEBUG -UDEBUG

COMMON_GLOBAL_CPPFLAGS:= $(COMMON_GLOBAL_CFLAGS) -Wsign-promo

COMMON_RELEASE_CPPFLAGS:= $(COMMON_RELEASE_CFLAGS)

# 不同包使用的扩展名

COMMON_PACKAGE_SUFFIX := .zip

COMMON_JAVA_PACKAGE_SUFFIX := .jar

COMMON_ANDROID_PACKAGE_SUFFIX := .apk

# flag列表改变错误中的不同警告

TARGET_ERROR_FLAGS := -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point

# 符号压缩

TARGET_COMPRESS_MODULE_SYMBOLS := false

# 包含底层配置文件

# -include:不是必须包含的

# 包含 buildspec.mk 可以设置一些东西。

# 如果文件不存在，则环境变量不会使用。如果不工作，则认为是arm build

ifndef ANDROID_BUILDSPEC

ANDROID_BUILDSPEC := $(TOPDIR)buildspec.mk

endif

-include $(ANDROID_BUILDSPEC)

# 包含一些环境设置

include $(BUILD_SYSTEM)/envsetup.mk